It also turns out that he fought the monster Majin Buu, as the North Kai reminds him in the Kid Buu Saga. He does not recognize Buu at first, wondering if he is training or "trying to kill us." When he remembers Buu, he teases Pikkon with the obvious truth that Buu is much stronger than him, much to Pikkon's dismay.
That was made up for the English dub, like a lot of things in the old dub scripts, unfortunately.
There's a short thread about it here.